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在合理考虑钢与混凝土之间的相互作用和选取正确的材料本构关系的基础上,建立钢管混凝土叠合柱-钢筋混凝土梁框架热-力耦合作用的有限元分析模型,并与现有相关试验数据进行对比,有限元分析结果与试验结果吻合良好;基于该有限元分析模型,对钢管混凝土叠合柱-钢筋混凝土梁平面框架在ISO-834标准火灾下的温度分布以及框架的工作机理进行分析,研究钢管混凝土叠合柱-钢筋混凝土梁平面框架在不同梁火灾荷载比下的变形规律和火灾作用过程中平面组合框架不同位置截面的内力变化。结果表明:钢管混凝土叠合柱-钢筋混凝土梁框架柱节点区的温度低于柱中部的温度,混凝土梁板对节点区柱截面温度分布有保护作用;不同梁火灾荷载比下,钢管混凝土叠合柱-钢筋混凝土梁框架均因梁跨中挠度变形速率过大而发生破坏,框架达到耐火极限,且随着梁火灾荷载比的增加,框架耐火极限减小;在火灾作用下,叠合柱中核心钢管混凝土承担大部分轴力。
Based on the reasonable consideration of the interaction between steel and concrete and the selection of the correct material constitutive relationship, a finite element analysis model of thermo-mechanical coupling behavior of CFST column-RC beam is established and related to the existing Based on the finite element analysis model, the temperature distribution and the working mechanism of the frame of CFST column-RC beam plane frame under ISO-834 standard fire were carried out The deformation of the CFSTP-CFRP beams with different beam load ratios and the variation of internal forces at different cross-sections of the CFRP frame during fire are analyzed and studied. The results show that the temperature at the node of CFST column-reinforced concrete beam is lower than the temperature at the center of the column, and the concrete beam has a protective effect on the temperature distribution in the column section. The column-reinforced concrete beam frame is destroyed due to the excessive deformation rate of the mid-span deflection, the frame reaches the fire resistance limit, and the fire resistance of the frame decreases with the increase of the beam fire load ratio. Under fire, Core steel-tube concrete bear most of the axial force.